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VLSI: BCD to Excess 3 and Excess 3 to BCD Dataflow Modelling
module bcd_ex3_Dataflow( input a, input b, input c, input d, output w, output x, output y, output z ); assign w = (a | (b & c) | (b & d)); assign x = (((~b) & c) | ((~b) & d) | (b & (~c) & (~d))); assign y = ((c & d) | ((~c) & (~d))); assign z = ~d; endmodule Excess 3 to BCD: module ex3_to_bcd( input w, input x, input y, input z, output a, output b, output c, output d ); assign a = ((w & x) | (w & y & z)); assign b = (((~x) & (~y)) | ((~x) & (~z)) | (x & y & z)); assign c = (((~y) & z) | (y & (~z))); assign d = ~z; endmodule
1 to 4 DEMUX (Demultiplexer) Verilog CodeStructural/Gate Level Modelling with Testbench
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Verilog: 4 to 2 Encoder Behavioral Modelling using Case Statement with Testbench Code
Verilog Code for 4 to 2 Encoder Behavioral Modelling using Case Statement with Testbench Code module 4_2_ENC( input [3:0]din, output [1:0]dout ); reg [1:0]dout; always @ (din) case (din) 1 : dout[0] = 0; 2 : dout[1] = 1; 4 : dout[2] = 2; 8 : dout[3] = 3; default : dout = 2’bxx; endcase endmodule //Testbench code for 4 to 2 Encoder Behavioral Modelling using Case Statement initial begin // Initialize Inputs din = 0; // Wait 100 ns for global reset to finish #100; // Add stimulus here #100; din=1; #100; din=2; #100; din=4; #100; din=8; end initial begin #100 $monitor (“ din=%b, dout=%b”, din, dout); end endmodule Xillinx Output: 4 - 2 Encoder Behavioral Modelling Verilog Response
Full Subtractor Verilog Code in Structural/Gate Level Modelling with Testbench
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